Build Failure on ports-10.6_x86_64_legacy

[buildbot at macports.org]

Status:       Failure
Build slave:  ports-10.6_x86_64_legacy
Full logs:    https://build.macports.org/builders/ports-10.6_x86_64_legacy-watcher/builds/23522
Build reason: The SingleBranchScheduler scheduler named 'ports' triggered this build
Port list:    gcc7 gcc6 gcc8 gcc9 isl
Subport list:
	- isl
	- libgcc8
	- libgcc7
	- libgcc6
	- gcc6
	- gcc7
	- gcc8
	- libgcc-devel
	- gcc9
Variants:     None
Revision:     c6701d823f2ffca23b63383c0e8bdcfc809aaf77
Build time:   7:26:50
Author:       Chris Jones <jonesc at macports.org>

Log from failed builds:

Links to individual build jobs:
- ports-10.6_x86_64_legacy-builder #99280
  https://build.macports.org/builders/ports-10.6_x86_64_legacy-builder/builds/99280
- ports-10.6_x86_64_legacy-builder #99281
  https://build.macports.org/builders/ports-10.6_x86_64_legacy-builder/builds/99281
- ports-10.6_x86_64_legacy-builder #99282
  https://build.macports.org/builders/ports-10.6_x86_64_legacy-builder/builds/99282
- ports-10.6_x86_64_legacy-builder #99283
  https://build.macports.org/builders/ports-10.6_x86_64_legacy-builder/builds/99283
- ports-10.6_x86_64_legacy-builder #99284
  https://build.macports.org/builders/ports-10.6_x86_64_legacy-builder/builds/99284

-- 
Best regards,
MacPorts Buildbot
https://build.macports.org/